// startAPIWorkers is called to start workers which rely on the
// machine agent's API connection (via the apiworkers manifold). It
// returns a Runner with a number of workers attached to it.
//
// The workers started here need to be converted to run under the
// dependency engine. Once they have all been converted, this method -
// and the apiworkers manifold - can be removed.
func (a *MachineAgent) startAPIWorkers(apiConn api.Connection) (_ worker.Worker, outErr error) {
agentConfig := a.CurrentConfig()
entity, err := apiagent.NewState(apiConn).Entity(a.Tag())
if err != nil {
return nil, errors.Trace(err)
}
var isModelManager bool
for _, job := range entity.Jobs() {
switch job {
case multiwatcher.JobManageModel:
isModelManager = true
default:
// TODO(dimitern): Once all workers moved over to using
// the API, report "unknown job type" here.
}
}
runner := newConnRunner(apiConn)
defer func() {
// If startAPIWorkers exits early with an error, stop the
// runner so that any already started runners aren't leaked.
if outErr != nil {
worker.Stop(runner)
}
}()
modelConfig, err := apiagent.NewState(apiConn).ModelConfig()
if err != nil {
return nil, fmt.Errorf("cannot read model config: %v", err)
}
// Perform the operations needed to set up hosting for containers.
if err := a.setupContainerSupport(runner, apiConn, agentConfig); err != nil {
cause := errors.Cause(err)
if params.IsCodeDead(cause) || cause == worker.ErrTerminateAgent {
return nil, worker.ErrTerminateAgent
}
return nil, fmt.Errorf("setting up container support: %v", err)
}
if isModelManager {
// Published image metadata for some providers are in simple streams.
// Providers that do not depend on simple streams do not need this worker.
env, err := newEnvirons(modelConfig)
if err != nil {
return nil, errors.Annotate(err, "getting environ")
}
if _, ok := env.(simplestreams.HasRegion); ok {
// Start worker that stores published image metadata in state.
runner.StartWorker("imagemetadata", func() (worker.Worker, error) {
return newMetadataUpdater(apiConn.MetadataUpdater()), nil
})
}
// We don't have instance info set and the network config for the
// bootstrap machine only, so update it now. All the other machines will
// have instance info including network config set at provisioning time.
if err := a.setControllerNetworkConfig(apiConn); err != nil {
return nil, errors.Annotate(err, "setting controller network config")
}
} else {
runner.StartWorker("stateconverter", func() (worker.Worker, error) {
// TODO(fwereade): this worker needs its own facade.
facade := apimachiner.NewState(apiConn)
handler := conv2state.New(facade, a)
w, err := watcher.NewNotifyWorker(watcher.NotifyConfig{
Handler: handler,
})
if err != nil {
return nil, errors.Annotate(err, "cannot start controller promoter worker")
}
return w, nil
})
}
return runner, nil
}